The invention discloses a tissue spreader, which comprises an outer pipe and a middle pipe which are sleeved with each other, wherein an inner rod is arranged in the middle pipe in a penetrating manner; the front end and the rear end of the inner rod can extend out of the middle pipe; the front end of the inner rod is connected with a spreading component; the spreading component comprises flexiblespreading arms distributed along a circumferential direction of the middle pipe in a spacing manner; the front end of any one of the flexible spreading arms is fixed with the front end of the inner rod, and the rear end of the flexible spreading arm is connected with an elastic ring; the middle parts of the flexible spreading arms are fixedly connected with the front end of the middle pipe through supporting arms; in an initial state, the flexible spreading arms are attached to the outer wall of the middle pipe, and then the inner rod is pulled back; the inner rod is withdrawn relative to themiddle pipe, and the supporting arms support the flexible spreading arms to be unfolded to spread the elastic ring; and the inner rod is pushed forwards, and the flexible spreading arms recover the initial state. The tissue spreader disclosed by the invention is simple in structure and convenient to use; and the surgical difficulty can be greatly reduced, and the surgical time can be shortened, so that the surgical risk is lowered.